How to say this using catch-phrases: "Test A requires a lot of tissue samples, whereas test B doesn't."?

I am about to prepare a talk that would compare two tests in the medical field. The old test requires 5 different sites of the organ to be sampled in order to have a result. The other test (which is the newly proposed) requires only one and gives more meaningful results. If I were to say this in bullets how can I express this idea in short? The nearest thing came to my mind is:

• Test A is sample-demanding while test B is not.

OR

• Test B is five times more tissue-sparing than test A.

I am not sure which one sounds correct, or is there any better way to say it?

Note:
I am surprised to find one of the answers disappearing. The answer that disappeared was the correct answer and I cannot accept any other answer unless the same one who disappeared comes back to accept his answer.

Solution 1:

There is a widely understood term in the medical field: invasive.

The proposed test is less invasive.

Patients prefer the less invasive test, as it is far less painful.

Physicians prefer the new test because of its greater diagnostic power.

Invasive fits well for a tissue or an organ biopsy.

The latter statement is more towards the OP's description of "more meaningful results." (There are ways to say "more meaningful results" to an audience that is familiar with statistics, such as statistical power, or p-values.)

Solution 2:

Perhaps Test A requires repeat-sampling while Test B does not. You could also use repetitive sampling, but that seems less like a label and more like a simple description.

If you were looking for idiomatic terms for both, you could refer to Test B as target-sampling (or targeted-sampling) in contrast to Test A, shotgun-sampling.